Screening device.



2 SHEETSSHEET I.

Patented Oct. 16, 1917.

M. P. REYNOLDS.

SCREENING DEVICE.

APPLICATION FILEID OCT. 16. I916 INVENTOR WITNESSES M. PJREYNOLDS.SCREENING DEVICE.

APPLICATION FILED OCT-16.1916.

Patented 0m. 16, 1917.

2 SHEETS-SHEET 2.

WITNESSES nearer runsnoiv anrnonns, orctnvnnenn, onIo, assrenoa ro THEW. s. 'lYJL COANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

scnnnnme-nnvrcn.

terraces.

Patented wet. i6, 191%.

Application filed October 18, 1916. Serial No. 125,783.

To all whom it may concern Be it known that I, MORLEY PUNSHON REYNOLDS,a citizen of the United States, and resident of Cleveland, in the countyof Cuyahoga and State of Ohio, have invented a new and usefulImprovement in Screening Devices; and I do hereby declare the followingto be a full, clear, and exact description thereof.

My invention pertains to automatically v1- brated screening devices, andrelates especially to screens for. use in screening materials of afinely divided nature. It is the principal object of my invention toprovide an automatically vibrated screening device, of such a naturethat the vibrations imparted thereto will reach their maximum efficiencyin performing the screening operation. It is another object of myinven-. tion to provlde a screening device in whlchv automatic feedinmeans are employed, and in which the fee ing means willoperate todistribute the material evenly over the screening surface. It is anotherobject of my invention to improve generally upon screening devices ofthe kind in which the screen is disposed on a slope and the material isfed to the upper part thereof, so as to slide downward thereover duringthe screening operation. And other and further objects of my inventionwill appear from the following specification taken in connection withthe claims appended thereto.

By way of example, I have shown in the accompanying drawings, anddescribed in the following specification, one form of screening deviceconstructed in accordance with my invention. It is to be understood,

' however, that my invention may be embodied in other forms, and thatchanges may be made in the form described and shown without exceedingthe scopethereof, as do: fined in the appended claims.

In the drawings:

Figure 1 is a sectional side elevation, of a partly diagrammatic nature,showing a screening device constructed in accordance with my invention;

Fig. 2 is a front elevation of the same;

Fig. 3 is a front view of the device for vibrating the feed board;

Fig. 4 is a plan of one of the screens proper, with the device forvibrating the] same;

Fig. 5 is a plan of the screen and vibrating device;

Fig. 6 is an enlarged section taken on the line 6-6 of Fig. 5; V v Fig.7 is a side'view of the screen shown in Fig. 4'; I

Fig. 8 is an enlarged section, taken on the line 88'of Fig. 4, lookingin the direction of the arrows; and

Fig. 9 is an enlarged section taken through the lower cross bar of thescreen frame, showing the means of attaching the screen cloth, thesection being taken on the line 9 9 of Fig. 4.

Like reference characters refer to like parts throughout the followingspecification and several figures of the accompanying drawings, I

Referring now to the drawings, my improved screening device includes acasing, in which are mounted one or more automatically vibrated screens.Inthe drawing, two of such screens are shown; but a greater or lessernumber may be used if desired. The

screens are alike, except that one is of a coarser mesh than the other;and the description of one of them, therefore, will suffice.

Each screen consists of a frame including a pair of side bars 10,preferably angle irons, and a pair of end bars 11 and 11, the same beingconnected at their corners by metallic braces 12, so as to form a rigidframe. To

' the upper end bar 11, is secured, by means of screws 13, a metallicstrip 14. Between the strip 14 and the end bar 11 there is clamped thetop edge of the screen cloth 15. The screen cloth 15 is of substantiallythe same width as the screen-frame, and extends to the lower endthereof. At such lower.

end, the screen cloth 15 is passed over a metallic bar 16, and isclaimed against the latter by means of a strip 1?, bolts 18 beingemployed for the purpose. In order to provide' for stretching the screencloth 15 lengthwise over the frame, and for adjusting the tension ofsuch screen cloth, I provide a plurality of cap screws 19, which passthrough the bar 16, and engage against Y I the end bar 11 of the'screenframe (Fig. 9).

By operating the cap screws 19, the tension of the screen cloth 15 maybeadjusted to the required degree; and, when properly adjusted, the capscrews may be secured in place by lock nuts 20.

At its center, the upper end bar 11 of the screen frame carries a spacinblock 21, to which, in turn, is secured a vi rator bar 22. The vibratorbar 22 is of substantially the same length as, and extends parallelwith, the top bar 11 of the screen frame; and it carries, near its ends,impact screws 23, the points of which likely engage the bar 11, near theends thereof; The impact screws 23 are adjustable and are kept in theiradjusted position by means of nut locks 24.

Mounted upon the vibrator bar 22, at the center thereof, is the core ofan alternating current vibrator magnet. The core is laminated, beingformed of a plurality of E- shaped plates 25, and upon its center arm isplaced a winding 26, which is connected to a suitable source ofalternating current, by means of conductors 27. Connected to thevibrator bar 22, with its ends intermediate the center and the end ofsaid vibrator bar, is a yoke 28, which carries, at its center the magnetand armature 29, the latter being placed in proximity to the poles ofthe magnet ,core. It will be seen that, when alternating current issupplied to the core. 26 through the conductor 27, a series ofalternating impulses, corresponding with the alternations of current,will act upon the armature 29, thereby causing the latter to vibraterapidly. The vibrations of the armature 29 will be transmitted throughthe yoke 28, to the vibrator 22, and thus to the impact screws 23. Theimpact screws will thus perform a very rapid hammerin action upon theends of the end bar 11 o the screen frame.

It is to be particularly observed that the vibrations, due to thehammering action of the impact screws 23 are imparted to the screenframe in the same plane as that which the screen cloth occupies. I havefound that this results in vibrations to the screen cloth which are ofan exceedingly efiicient nature,

in so far as the performance of the screening operation is concerned. Itis to be noted, further, that the vibrations are imparted to the screenframe along a line which is substantially coincident with the line uponwhich the screen cloth is stretched. The re- 3, the casing, or housing,within which the screens, or screen, are mounted, includes a bottom 32disposed at a comparatively steep angle, and a front 33, which is sodisposed as to form, with the bottom 32, a funnel which will direct thescreened material to a suitable delivery chute 34. Side walls 35, and ahinge cover 36, complete the main bod portion of the housing. Mounted inthe housing are a pair of screens constructed as described above.provided with ascreen 010th of comparatively coarse mesh as is referredto, as a whole, as 37. The other screen, 38, is provided with a screencloth of finer mesh, and is disposed below the screen 37 and paralleltherewith. The housing front 33 is provided with a delivery-spout 39 forthe tailings, and with a second delivery spout 40 for the intermediatematerial.

The screens 37 and 38 are both vibrated and the material is poured overthescreen 37 from the top. The coarse part of the screening operation isthus performed by the screen 37 and the finer screening by the screen38. In this way the strain which would otherwise be imparted to thescreen 38 is lessened, and the wear of the fine screen cloth of thelatter is decreased.

The material to be screened is fed to the screen 37, by an automaticdevice. This automaticfeeding device includes a feed box having, at itslower part, an inclined feed board 41 from which the material can pouronto a chute board 42, which directs the material onto the screen 37.Extending across the feed box, within the latter, is a shaft 43, adaptedto be continuously rotated by means of a pulley 44 which latter isconnected to a suitable source of power. The shaft 43 carries a spiralconvey'er 45, which operates to spread the material evenly over the feedboard 41, so as to allow such material to.

pour off the board 41 as evenly as possible. In order to provide for thegreatest possible uniformit in the pouring of the material from the feedboard 41 to the chute board 42, I vibrate the feed board 41 by means ofa device which is nearly similar to that employed for vibrating thescreens. Such virating device includes a vibrator bar 46 having impactscrews 47, which engage against the bottom of' the feed board 41, nearthe lower edge thereof. The vibrator bar 46 is vibrated by analternating electromagnet 48. This magnet is similar in construction,and operates in a like way, to the magnet described above in connectionwith the screens, and further description is, therefore, not necessary.

In order to permit control of theamount of material flowing from thefeed board 41 onto the chute 42 and thus to One of these screens isboard 41 and can be used to increase or.decrease the amount of materialpouring from said feed board, according as the gate is raised orlowered. The housing is provided with a hinged door 52, which permitsinspection of the feed box and feed board, and it is also provided witha second hinged door 53, which permits inspection of the screensthemselves.

The screening device described above has I manifold advantages. Amongthem is that it permits of an accurate and even feeding of the materialto the screens, and allows the quantity of material fed to be properlycontrolled, in accordance with the nature of the material and thecapacity of the screens. Another advantage is that the device is simpleto construct and easy'to install, while it is very convenient in use,permitting observatlon and study of all the operations. Another, and avery important, advantage lies in the extreme high screening efliciency,due to the construction of the screens, and the manner of imparting thevibrations thereto.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent is:

1. A vibrating screen comprising a screen frame, a screen cloth attachedat one end with respect to said frame, means for attaching the other endof said screen cloth with respect to said frame, said secondnamedattaching means being longitudinally adjustable, to permit variation ofthe tension of the screen cloth, a magnetic device for impartinghigh-speed vibrations to said frame, said device being arranged so as toimpart such vibrations substantially in the plane of said screen clothand in a line with the line of tension of said screen cloth, and saiddevice and frame being immovably mounted with respect to each other, andauxiliary supporting means extending across said frame, beneath saidscreen cloth.

2. A vibrating screen comprising a screen frame, a screen cloth, meansfor attaching one end of said creen cloth with respect to said screenframe, means for attaching the other end of said screen cloth withrespect to said screen frame, said second-named attaching means beingconstructed so as to permit adjustment of the tension of said screencloth, a device for imparting high-speed vibrations to said screen framesaid device being arranged so as toimpart such vibrations substantiallyin the plane of said screen cloth and in a line with the line of tensionthereof, and said device and frame being immovably mounted with respectto each other, and auxiliary reticulate rigidifying means carried bysaid screen frame.

3. A vibrating screen comprising a rigidly constructed screen frameformed of resilient material, a screen cloth stretched upon said .screenframe, and means carried by said means and said support being immovablymounted with respect to each other.

5. Avibrating screen comprising a screen cloth, a support for saidscreen cloth, means for attaching one end ofsaid screen cloth to saidsupport, means forattaching the other end of said screen cloth to saidsupport, said second-named means. being adjustable to allow variation ofthe tension of said screen cloth, and a device for imparting relativelyrapid vibrations to said support, said device being arranged so as toimpart said vibrations substantially in the plane of said screen cloth,and in a line with the line of,

tension of said screen cloth, and said device and said support beingimmovable with respect to each other.

6. In a vibrating screen, a screen cloth, a support for said screencloth, said support including means for adjusting the tension of saidscreen cloth, and a device carried by said support for impartlngvibrations thereto, said device being arranged so as to.

impart such vibrations substantially in the plane of saidscreen clothand in a line wlth. the line of tension of said screen cloth.

loo

7. A vibrating screen comprising a sup port, a screen cloth stretchedupon said sup-' port, and a device for imparting relatively rapidvibrations to said support substantially in the plane of said screencloth,.said

. device and said support being immovably mounted with respect to eachother.

8. In a vibrating screen, a rigidly constructed frame formed ofresilient material, a screen cloth stretched upon said frame, and adevice carried by said frame for imparting vibrations theretosubstantially in the plane of said screen cloth.

9i In a vibrating screen, a screen frame, means for attaching a screencloth to said frame, and a device for imparting vibrations to saidscreen frame substantially in the plane thereof, said device and saidframe being immovably mounted with respect to each other.

10. In a vibrated screen, a screen cloth, means for stretching saidscreen cloth, and a device for imparting vibrations to said screen clothsubstantially in the plane thereof, said device and said screen clothbeing immovably mounted with respect to each other. I

11. In a vibrating screen, a screen cloth,

a support for said screencloth, and a device 30 for imparting vibrationsto said screen cloth substantially in the plane thereof, said device andsaid screen cloth being immovably mounted with respect to each other.

12. In a vibrating screen, a screen frame, means, at one end of saidframe for attaching one end of a screen cloth thereto, means, at theother end of said frame, for attaching the other end of said screencloth thereto, said last named attaching means being adjustable to varythe tension of the screen cloth, and-a device for imparting vibrationsto said frame, said device being arranged so as to impart suchvibrations substantially in the plane of said frame, and substantiallyin the line of operation of said adjustable attaching means.

13. A screening device comprising a frame, a screen carried by saidframe, a bar secured to said frame parallel with one end thereof,

thereof, the ends of said bar being free, ad-

justable means carried by the ends of said bar for striking said framewhen said bar is vibrated, and electrical means for vibrating said bar.

In testimony whereof, I, the said MORLEY PUNSHON REYNOLDS have hereuntoset my hand.

MORLEY PUNSHON REYNOLDS.

Witnesses FRED G. CURTIS, H. G. COATES.

